Re: fake stats to a particular partition
- From: Riyaj Shamsudeen <rshamsud@xxxxxxxxxxxx>
- To: sjaffarhussain@xxxxxxxxx
- Date: Thu, 10 Aug 2006 13:08:56 -0500
It's quite easy to do that. You could take one of the partition
statistics as representative statistics and copy from the partition to
other partitions. Here are the steps:
1. Create a stat_table and export the partition statistics..
DBMS_STATS.create_stat_table ( ownname=>'scott', stattab
2. Then insert new rows by copying stats from a partition. For example,
in this case, I am populating stats to partitions 251-400 from 250th
partition stats. Partition names are of the format PART_01_251 through
PART_01_400 etc for us, so, you might have to change this based upon
your naming convention.
FOR i in 251 .. 400 loop
INSERT INTO stats_on_apr07 (
STATID, TYPE , VERSION , FLAGS ,
C1 , C2 , C3, C4 , C5 ,
N1 , N2 , N3, N4 , N5 , N6, N7, N8, N9, n10,N11,N12,
D1 , R1 , R2 , CH1 )
select STATID, TYPE ,VERSION , FLAGS ,
C1 , 'PART_'||substr(c2,6,2)||'_'||lpad(i,3,'0') , C3, C4 , C5 ,
N1 , N2 , N3 , N4 ,N5, N6, N7, N8, N9,
D1 , R1 , R2 , CH1
FROM STATS_on_apr07 WHERE C2 like 'PART_%_250';
3. Import statistics.
Only problem here is that this not update the table level statistics,
meaning if 1 million rows added to 251th partition, table level
statistics does not reflect that. But, that is fine for us due to table
PS: Version:10gR1. Might need adjustments for different versions.
Syed Jaffar Hussain wrote:
Is there any way that we can set fake statistics to a particular
partiton of a partitioned table?
As I had asked a question sometime back that insert and other stuff
are very slow on the first day of a new partition(monthly partitions).
I would like to set fake statitics to a partition of a partition table.
Thanks for your time.
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